SCHEDULING PROBS AND ADJUSTMENTS OF ASSIGNMENT TIMES AFTER THE DUTY PERIOD BEGINS IS ALLEGED TO HAVE RESULTED IN NON COMPLIANCE WITH PLT DUTY TIME RULES.

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I WAS ON A RESERVE ON FEB/THU. ON FEB/WED; I WAS ASSIGNED AN ASSIGNMENT OF XA00-XO54 FOR THURSDAY. IN THE MORNING ON THURSDAY; I CHKED THE COMPUTER TO FIND THAT DURING MY REST PERIOD (XO00) I HAD BEEN ASSIGNED SEQUENCE THAT SIGNED IN AT XE00. I CHKED TO SEE WHEN THE FIRST DAY'S DUTY ENDED AND IT WAS SCHEDULED TO END AT XN00 (BEFORE THE XO00 END OF MY ASSIGNMENT) SO I FELT I WAS LEGAL TO FLY. HOWEVER; WHEN I SIGNED IN FOR THE TRIP; I NOTICED THAT MY SCHEDULE NOTED BEGAN THURSDAY AT XE27 AND ENDED FRIDAY AT XQ00. SINCE THE FLT WAS SCHEDULED TO BE COMPLETED BEFORE WHAT I CONSIDERED TO BE THE END OF MY ASSIGNMENT (XQ52) I DIDN'T REACT TO THE FRIDAY XQ52 TIME. I DEADHEADED TO MIA FOR MY LEG TO ATL. THE ACFT WE WERE SUPPOSED TO TAKE TO ATL WAS LATE ARRIVING. WE WERE LATE GETTING STARTED TO ATL AND THEN; AFTER LEAVING THE GATE; WE LOST OUR L PACK. THIS NECESSITATED A RETURN TO THE GATE FOR MAINT ACTION AND FUEL. IN THE CONFUSION AND DESIRE TO SUCCESSFULLY GET THE FLT TO ATL; I QUICKLY CHKED TO MAKE SURE I WOULD BE DOWN BY THE END OF MY ASSIGNMENT WHICH; ACCORDING TO MY SCHEDULE; WAS NOW XQ52 ON FRIDAY. WE DID MANAGE TO MAKE IT TO ATL BEFORE XQ52. AS I REVIEWED THE RECORD OF MY SEQUENCE THIS AFTERNOON (MONDAY) I BELIEVE THAT MY ORIGINALLY ASSIGNED ASSIGNMENT ON THURSDAY SHOULD HAVE ENDED AT XQ00 ON FRIDAY XA00 (START TIME PLUS 16 HRS). THUS; I BELIEVE I MAY HAVE INADVERTENTLY GONE ILLEGAL ON MY LEG TO ATL. I CHKED THIS AFTERNOON AND THEY CONFIRMED MY BELIEF. IF THIS IS THE CASE; THEN I THINK MY SCHEDULE WAS WRONG TO SHOW THAT MY ASSIGNMENT BEGAN AT SIGN-IN (XE27) AND ENDED AT XQ52 ON FRIDAY. AS I UNDERSTAND IT; ONCE XM00 PASSES ON THE DAY PRIOR AND I AM ASSIGNED AN ASSIGNMENT (IN THIS CASE; AN XA00-XO59 ASSIGNMENT) THEN MY DUTY DAY STARTS AT XA00 AND SCHEDULING CAN'T CHANGE THAT AND DISPLAYING A NEW START TIME FOR MY ASSIGNMENT ON THE SCHEDULE IS MISLEADING. MY SCHEDULE SHOULD HAVE STATED THAT MY ASSIGNMENT ENDED AT XO59. IF I AM WRONG ABOUT THIS; THEN I HAVE NO IDEA HOW THEY ARRIVED AT AN ASSIGNMENT END TIME OF XQ52 ON THAT FRIDAY. I KNOW THIS IS CONFUSING; BUT I THINK THIS SHOULD BE CLARIFIED IN ORDER TO KEEP US FROM INADVERTENTLY GOING ILLEGAL WHILE ADHERING TO THE INFO ON THE SCHEDULE. BY THE WAY; I CANNOT REMEMBER WHAT THE MANDATORY OFF-TIME WAS ON THE FLT PLAN. I SHOULD HAVE RECALLED THAT; BUT I DIDN'T SINCE I WASN'T AWARE OF A PROB DURING THE FLT. HOPE YOU CAN FOLLOW THIS. PLEASE LET ME KNOW IF I DID SOMETHING WRONG OR HAVE A MISUNDERSTANDING ABOUT THE DUTY DAY.